Brad Pickett retired from a decorated mixed martial arts career having retired from the UFC on March 18, after losing with 70 seconds to go against Marlon Vera at UFC FIGHT NIGHT London. The send off for the popular fighter was extraordinary. Yet Pickett is back, and will compete in submission grappling

The Ultimate Fighting Championship, also known as UFC, has become one of the fastest-growing sports in the US and in the last few years increasingly caught the attention of fight fans in the UK, too. But what is it, how was it formed and what are the rules? Here's our guide on what you need to know